With new routes/OW partners this is about the max I can come up with not using any intercontinental transits (until I see it in writing in the fare rules I'd be very sceptical about it being officially allowed although I can believe someone in airline reservations saying you can do it and even ticketing it!)
I'm sure some extra miles could be worked out in North America but I have excluded flights like SJU-ANC which is only a seasonal flight and I'm sure only in the current timetable - next year it will almost certainly not be a single flight number.


From To Distance
34 segment path: 110701 mi
PER SYD 2067 mi < 24hr stop
SYD PPT 3832 mi
PPT SYD 3832 mi
SYD JFK 9942 mi < 24hr stop
JFK SJU 1597 mi
SJU DFW 2165 mi < 24hr stop
DFW ANC 3042 mi
ANC DFW 3042 mi < 24hr stop
DFW JFK 1391 mi < 24hr stop
JFK LAX 2474 mi
LAX SCL 5571 mi < 24hr stop
SCL BOG 2599 mi
BOG SCL 2599 mi < 24hr stop
SCL CCS 3008 mi
CCS SCL 3008 mi
SCL LAX 5571 mi < 24hr stop
LAX LHR 5455 mi
LHR MCT 3636 mi
MCT LHR 3636 mi < 24hr stop
LHR LCA 2047 mi
LCA LHR 2047 mi < 24hr stop
LHR MRU 6047 mi
MRU NBO 1924 mi < 24hr stop
NBO SEZ 1305 mi
SEZ NBO 1305 mi
NBO LLW surface
LLW JNB 933 mi < 24hr stop
JNB HKG 6643 mi < 24hr stop
HKG KHI 2978 mi
KHI HKG 2978 mi < 24hr stop
HKG BOM 2672 mi
BOM HKG 2672 mi < 24hr stop
HKG NRT 1819 mi
NRT SYD 4797 mi < 24hr stop
SYD PER 2067 mi

The itin that PaulSEA1 posted above was not aimed at maximum number of flight miles but at getting last year's 100,000 bonus mile promotion in each of the then six OW programs


[This message has been edited by 3544quebec (edited 09-02-2000).]